/*
  *   Copyright (c) 1998, Regents of the University of California
  *   All rights reserved.
  *   Redistribution and use in source and binary forms, with or without
  *   modification, are permitted provided that the following conditions are met:
  * 
  *       * Redistributions of source code must retain the above copyright
  *         notice, this list of conditions and the following disclaimer.
  *       * Redistributions in binary form must reproduce the above copyright
  *         notice, this list of conditions and the following disclaimer in the
  *         documentation and/or other materials provided with the distribution.
  *       * Neither the name of the University of California, Berkeley nor the
  *         names of its contributors may be used to endorse or promote products
  *         derived from this software without specific prior written permission.
  * 
  *   THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
  *   EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  *   DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
  *   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */



package org.demis.dwarf.core.db.upgrade;

import org.demis.dwarf.core.db.Schema;
import org.demis.dwarf.core.db.Table;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author <a href="mailto:demis27@demis27.net">Stéphane Kermabon</a>
 */
public abstract class SchemaDiff {

    protected List<Table> tablesAdded = new ArrayList<Table>();

    protected List<Table> tablesRemoved = new ArrayList<Table>();

    protected List<Table> tablesModified = new ArrayList<Table>();

    protected Schema origin;

    protected Schema target;

    public SchemaDiff(Schema origin, Schema target) {
        this.origin = origin;
        this.target = target;
        processDiff();
    }

    private void processDiff() {
        // check removed tables
        for (Table originTable: origin.getTables()) {
            if (target.getTable(originTable.getName()) == null) {
                tablesRemoved.add(originTable);
            }
        }
        // check added tables
        for (Table targetTable: target.getTables()) {
            if (origin.getTable(targetTable.getName()) == null) {
                tablesAdded.add(targetTable);
            }
        }
    }

    protected abstract String createDiffScript() ;
}
